Ticket #41966: 41966.patch

media-views.css

@@ -857 +857 @@
                 inset 0 0 0 1px rgba( 0, 0, 0, 0.05 );
         background: #eee;
         cursor: pointer;
+        background-position: 0px 0px, 10px 10px;
+    background-size: 20px 20px;
+    background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%),linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
 }
 
 .wp-core-ui .attachment-preview:before {